Object tracking in wireless sensor networks is to track moving objects by scattered sensors. These sensors are typically organized into a tree to deliver report messages upon detecting objects move. Existing tree construction algorithms all require a mobility profile that is obtained based on historical statistics. In this paper, we propose an analytic estimate of such mobility profile based on Markov-chain model. This estimate replaces otherwise experimental process that collects statistical data. Simulation results confirm the effectiveness of the proposed approach.
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